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Although the research on the medicinal use of cannabis is strong, several studies indicate that the recreational use of cannabis can have persistent adverse effects on mental health. According to a 2013 report published in Frontiers in Psychiatry , depending on how often someone uses, the age of onset, the potency of the cannabis that is used and someone’s individual sensitivity, the recreational use of cannabis may cause permanent psychological disorders. Most recreational users will never be faced with such persistent mental illness, but in some individuals cannabis use leads to undesirable effects, including cognitive impairment, anxiety, paranoia and increased risks of developing chronic psychosis or drug addiction. ( 24 )